| 摘要 |
PURPOSE:To prevent a dry-out phenomenon and bumping and contrive to enhance heat-conveying performance, by providing a return pipe between a heat- collecting plate provided at an evaporating part and a bottom surface of a collector. CONSTITUTION:Solar rays transmit through a light-transmitting body 6a provided on the front face of a collector 6, and are absorbed by the heat-collecting plate 9 at the evaporating part 11. The light absorbed is converted into thermal energy, which is transmitted to heat-collecting pipes 10 to boil and evaporate a working fluid 18 contained in the pipes 10, whereby it is removed as latent heat of evaporation,and bubbles 19 are generated. When the solar radiation quantity is small or the temperature of a condensing part 14 is high, a circulating force of the fluid 18 becomes weak, and when the bubbles generated in the return pipe 16 provided in the collector 6 grow to have a large buoyancy, the circulating force may be canceled with the result that a normal circulating operation is hindered. However, since the return pipe 16 is provided between the evaporating part 11 and the lower surface 17 of the collector 6, solar heat is shielded by the heat-collecting plate 9, and the return pipe 16 is not heated, so that generation of bubbles in the return pipe 16 is prevented from occurring. Accordingly, the working fluid 18 is circulated normally, the dry-out phenomenon and bumping can be prevented from occurring, and a high heat-conveying performance can be secured. |
